package demon;

public interface USB {
    public static final int a=10;
    public static final int c=29;
    public abstract void Open();
    public abstract void Close();
}
class Mose implements USB{
    @Override
    public void Open(){
        System.out.println("打开电脑");
    }
    @Override
    public void Close(){
        System.out.println("关闭电脑");
    }
    public static void main(String[] args) {

    }
}
